Layer 0: Foudation Cheat Sheet

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1. The Building Materials (Data Types)

In Apex, "Types" are your raw materials. You must define the material before you can build the layer.

Type	The "Admin" Translation	Example Apex Code
String	Text / Picklist Value	String channel = 'Absenthome';
Integer	Number (Whole numbers only)	Integer servers = 3;
Decimal	Currency / Percent / Latitude	Decimal cost = 99.99;
Boolean	Checkbox (True or False)	Boolean isOnline = true;
Id	15 or 18-digit Record ID	Id myRecordId = '001000000000000';

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2. The Containers (Collections)

We don't just let materials roll around; we put them in containers.

The List (The Assembly Line)

Use a List to hold multiple items in a specific order.

// Creating a list of strings
List<String> tools = new List<String>{'VS Code', 'CLI', 'Git'};

// Adding a new item
tools.add('GitHub');

// Getting the first item (Index 0)
String primaryTool = tools[0]; 

The sObject (The Apartment)

A container that holds all the fields for a specific Salesforce record.

Account myAppt = new Account(
    Name = 'Absenthome HQ', 
    Description = 'Architecting the Automated Life'
);

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3. The Logic (Control Flow)

Logic is the "wiring" that makes the building functional.

The Decision (If/Else)

Boolean doorLocked = true;

if (doorLocked) {
    System.debug('Access Denied: Door is locked.');
} else {
    System.debug('Access Granted: Welcome to the Lab.');
}

The Engine (For Loop)

Use this to repeat an action without writing the code multiple times.

// Constructing 5 floors automatically
for (Integer i = 1; i <= 5; i++) {
    System.debug('Constructing floor number ' + i);
}

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4. The Studio Commands (CLI Basics)

The essential commands for your terminal in the Absenthome Studio.

Command	Action
sf org login web -d	Authenticate: Connect your browser to your dev org.
sf project generate -n Lab	Initialize: Create your local project folder.
sf project deploy start	Push: Send your local code up to Salesforce.
sf org open	Launch: Open your org directly from the terminal.

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The "Absent" Pro-Tip

Always remember to end your lines with a semicolon ;. In the world of architecture, a missing semicolon is like a missing bolt in a skyscraper—the whole thing comes down.